Exceptionally coarse grained felsic plutonic rocks that are rich in rare minerals and trace elements are probably ________.
A)pegmatites
B)obsidians
C)porphyrys
D)welded tuffs

Question

Quizplus · Accepted Answer

Pegmatites are coarse grained felsic plutonic rocks that are typically found in veins and are enriched in rare minerals and trace elements. They form when magma cools slowly within the Earth's crust, allowing for the growth of large crystals. Obsidians are volcanic glass, porphyrys are igneous rocks with larger crystals in a fine-grained groundmass, and welded tuffs are volcanic rocks formed from the consolidation of volcanic ash. None of these options fit the description given in the question.

Exceptionally Coarse Grained Felsic Plutonic Rocks That Are Rich in Rare